This document provides a historical background and overview of Pakistan International Airlines (PIA). It discusses how PIA was formed in 1955 through the merger of Orient Airways and Pakistan Airways to serve as the national carrier of Pakistan. It details PIA's initial routes and fleet expansion over the decades as it grew to become one of the largest airlines in Asia. The document also outlines some of PIA's achievements and challenges over the years in developing its network and adapting to changes in technology and management.